The electronic configuration of 59Pr ( praseodimium) is
[54Xe] 4f25d16s2
[54Xe] 4f15d16s2
[54Xe] 4f36s2
[54Xe] 4f35d2
The bond lenght (pm) of F2, H2, Cl2 and I2, respectively is:
144, 74, 199, 267
74, 144, 199, 267
74, 267, 199, 144
144, 74, 267, 199
Which of the following corresponds to the energy of the possible excited state of hydrogen?
-13.6 eV
13.6 eV
-3.4 eV
3.4 eV
Which one of the following statement is correct for d4 ions [ P = pairing energy]
When Δ0 > P, low-spin complex form
When Δ0 < P, low-spin complex form
When Δ0 > P, high-spin complex form
When Δ0 > P, both high and low-spin complex form
Commercially available H2SO4 is 98 g by H2SO4 and 2g by weight of water. It's density is 1.38 g cm-3. Calculate the molality (m) of H2SO4 (molar mass of H2SO4 is 98 g mol-1).
500 m
20 molal
50 m
200 m
Standard enthalpy (heat) of formation of liquid water at 25°C is around
H2(g) + O2(g) → H2O (l)
-237 kJ/mol
237 kJ/mol
- 286 kJ/mol
286 kJ/mol
Given ΔHf° for CO2(g) , CO(g) and H2O(g) are -393.5, -110.5 and -241.8 kJ mol-1, respectively. The ΔHf° [in kJ mol-1] for the reaction
CO2(g) + H2(g) → CO(g) + H2O (g) is
524.1
-262.5
-417
412
Oxidation of cyclohexene in presence of acidic potassium permaganate leads to
glutaric acid
adipic acid
pimelic acid
succinic acid